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<p>Flexible optoelectronic materials are becoming an emerging research area due to their unique flexibility and processing feasibility. However, the development of flexible crystals with long afterglow remains a formidable challenge. Herein, flexible crystals with long afterglow are achieved by enriching and stabilizing triplet excitons through crystal engineering and host-guest doping. These flexible crystals exhibit multi-channel emission and a phosphorescent lifetime of 966.24 ms under ambient conditions, significantly surpassing previously reported flexible crystals with afterglow properties. Notably, high-temperature phosphorescence, which is rarely observed in crystals, can be detected in the obtained material. Single-crystal analysis and theoretical calculation reveal that weak C–H⋯π and π⋯π interactions contribute to the flexibility of the crystals. The crystals possess an elastic modulus of 0.081 GPa and an average hardness of 0.004 GPa, characteristics that are highly uncommon in the field of flexible optoelectronics. Ultimately, flexible crystals are applied in optoelectronic information transmission and encryption. This study provides a crucial reference for the advanced application of flexible crystals in optical and material sciences.</p>

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Efficient manipulation of triplet excitons for long afterglow in flexible crystals

  • 期刊论文

  • 发表日期：

    2026年4月13日

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  • Zhiqin Wu,
  • Jian Liu,
  • Zhenyi He,
  • Jingyu Cao,
  • Baolei Tang,
  • Lei Zhou,
  • Yang Li,
  • Hongyu Zhang,
  • Xiang Ma

摘要

Flexible optoelectronic materials are becoming an emerging research area due to their unique flexibility and processing feasibility. However, the development of flexible crystals with long afterglow remains a formidable challenge. Herein, flexible crystals with long afterglow are achieved by enriching and stabilizing triplet excitons through crystal engineering and host-guest doping. These flexible crystals exhibit multi-channel emission and a phosphorescent lifetime of 966.24 ms under ambient conditions, significantly surpassing previously reported flexible crystals with afterglow properties. Notably, high-temperature phosphorescence, which is rarely observed in crystals, can be detected in the obtained material. Single-crystal analysis and theoretical calculation reveal that weak C–H⋯π and π⋯π interactions contribute to the flexibility of the crystals. The crystals possess an elastic modulus of 0.081 GPa and an average hardness of 0.004 GPa, characteristics that are highly uncommon in the field of flexible optoelectronics. Ultimately, flexible crystals are applied in optoelectronic information transmission and encryption. This study provides a crucial reference for the advanced application of flexible crystals in optical and material sciences.